hi,
i have 2 related classes A and B mapped to different tables :
''<class name="A" table="T1" >
<id name="id" type="long" column="INDENT1">
<generator class="sequence">
<param name="sequence">uid_sequence</param>
</generator>
</id>
<property name="param1" type="string" column="column1"/>
<joined-subclass name="B" schema="siebesr" table="T2">
<key column="INDENT1"/>
<property name="param2" type="string" column="column2"/>
</joined-subclass>
</class>''

class B extends class A.

when i look for the object A using :
''session.createQuery("from A objet where objet.id = :id");''

hibernate generate the following SQL :
"select ...
from T1 t1 left outer join T2 t2 on t1.INDENT1=t2.INDENT1 where (t2.INDENT1=? )"

I need to parameter this join.

1) why hibernate make join between T1 and T2 eventhough i looked for just the object A?
2) is there a way to avoid this join when i don't need it; and to force the join when i need it?

Never used myself, but the proxy attribute of join-subclass might do what you want.

I have same problem, any body can help me ?